42979515 has 16 divisors (see below), whose sum is σ = 68970528. Its totient is φ = 22854656.

The previous prime is 42979507. The next prime is 42979523. The reversal of 42979515 is 51597924.

It is an interprime number because it is at equal distance from previous prime (42979507) and next prime (42979523).

It is a cyclic number.

It is not a de Polignac number, because 42979515 - 2³ = 42979507 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1237 + ... + 9353.

It is an arithmetic number, because the mean of its divisors is an integer number (4310658).

Almost surely, 2^42979515 is an apocalyptic number.

42979515 is a deficient number, since it is larger than the sum of its proper divisors (25991013).

42979515 is a wasteful number, since it uses less digits than its factorization.

42979515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8478.

The product of its digits is 113400, while the sum is 42.

The square root of 42979515 is about 6555.8763716226. The cubic root of 42979515 is about 350.2841637838.

The spelling of 42979515 in words is "forty-two million, nine hundred seventy-nine thousand, five hundred fifteen".